Alarm ringing without a reason
- Make
- Alfa Romeo
- Model
- Brera and Spider Factory Service Manual
- Year
- 2005–2010
- Section
- Alarm › Alarm ringing without a reason
ALARM RINGING WITHOUT A REASON
With the alarm on the alarm cycles are set off without any apparent cause and without any attempts to break into the vehicle.
If it is not possible to stop the siren and deactivate the alarm using the remote control, simply activate the instrument panel by inserting the key in the key recognition device. The system can recognize the transponder and switch off the alarm system in this way.
| Test results | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
| Check in the passenger compartment that no flying creature has entered that is causing the activation of the alarm or any moving object that may be detected by the volumetric sensors | Move on to Step 1 | Flying creature that has been detected by the volumetric sensors when it moves | Remove the cause of the alarm | |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the Examiner equipment to the diagnostic socket and check at the Body Computer Node for the presence of any errors in the alarm memory | Move on to Step 2 | Presence of errors | Proceed as instructed by the diagnostic tester | |
| 2 | ANTI-LIFT PROTECTION CHECK | All OK | Problems encountered | Operation |
| Connect the diagnostic equipment to the diagnostic socket and check at the Body Computer Node in active diagnosis that the anti-lift sensor is working properly | Move on to Step 3 | Anti-lift/ultrasound sensor faulty | Replace the sensor | |
| 3 | PERIPHERAL PROTECTION CHECK | All OK | Problems encountered | Operation |
| Connect the diagnostic equipment to the diagnostic socket and check at the Body Computer Node that the microswitches for the doors, bonnet and boot are working properly. | Move on to Step 4 | There are faults present | Replace the element that is faulty. | |
| 4 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the Examiner diagnostic equipment to the diagnostic socket and check the condition of the A-Bus serial line between the Body Computer Node and the siren at the Body Computer Node in active diagnosis | Move on to Step 5 | Fault at A-BUS serial line | Repair the A-BUS serial line | |
| 5 | SIREN POWER SUPPLY CHECK | All OK | Problems encountered | Operation |
Check that the siren power supply is correct and check the condition of the connections | End of diagnosis | Siren power supply not correct | Restore the correct power supply | |
| Vehicle battery run down (voltage below 3 Volt) | Recharge the battery | |||
| Body Computer defective | Replace Body Computer | |||
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